a system of cultivation intended to maintain permanent agriculture or horticulture by relying on renewable resources and a self-sustaining ecosystem.

permaculturist, permaculturalist, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
permaculture (ˈpɜːməˌkʌltʃə)
the practice of producing food, energy, etc, using ways that do not deplete the earth's natural resources
[C20: coined by Bill Mollison (born 1928), Australian ecologist, from perma(nent agri)culture]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source's 21st Century Lexicon
Main Entry:  permaculture
Part of Speech:  n.
Definition:  See permacultural's 21st Century Lexicon
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Example sentences
Permaculture, local farming and local organic farming is the way to solve all
  our food problems and uses less petrol to do so.
For example, they host tree planting dance parties and teach kids circus skills
  while throwing in tips on permaculture.
The eco-ideology known as permaculture has entered the mainstream.
In fact some of the species promoted by permaculture can be serious
  environmental weeds.
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